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RS-422
RS-422, also known as TIA/EIA-422, is a technical standard originated by the Electronic Industries Alliance that specifies electrical characteristics of a digital signaling circuit. Differential signaling can transmit data at rates as high as 10 Mbit/s, or may be sent on cables as long as 1500 meters. Some systems directly interconnect using RS-422 signals, or RS-422 converters may be used to extend the range of RS-232 connections. The standard only defines signal levels; other properties of a serial interface, such as electrical connectors and pin wiring, are set by other standards.
==Standard scope==
RS-422 is the common short form title of American National Standards Institute (ANSI) standard ''ANSI/TIA/EIA-422-B Electrical Characteristics of Balanced Voltage Differential Interface Circuits'' and its international equivalent
''ITU-T Recommendation T-REC-V.11'',〔http://www.itu.int/rec/T-REC-V.11/en V.11 ITU Recommendation T-REC-V.11〕 also known as ''X.27''. These technical standards specify the electrical characteristics of the balanced voltage digital interface circuit.〔''TIA/EIA STANDARD, Electrical Characteristics of Balanced Voltage Digital Interface Circuits, TIA/EIA-422-B'', May 1994〕 RS-422 provides for data transmission, using balanced, or differential, signaling, with unidirectional/non-reversible, terminated or non-terminated transmission lines, point to point, or multi-drop. In contrast to EIA-485 (which is multi-point instead of multi-drop), RS-422/V.11 does not allow multiple drivers but only multiple receivers.
Revision B, published in May 1994 was reaffirmed by the Telecommunications Industry Association in 2005.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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